Packaging device and method for absorbing moisture

ABSTRACT

A packaging device and method for absorbing and reducing moisture as well as a manufacturing process for such device. The packaging device is a container made from paperboard such as containerboards or linerboards with a corrugated medium. The paperboard is insulated with moisture absorbing additives comprising charcoal, activated charcoal, activated carbon, or substances mostly comprised of carbon. Perforations may be added in the boards to further permit moisture to reach the corrugated medium, permitting further absorption by the additives embedded within the corrugated medium in between the boards. This packaging device and method is favorable for storing or transporting objects which are sensitive to or would benefit from low moisture/humidity conditions.

This application is a continuation of application Ser. No. 10/774,925filed on Feb. 9, 2004, which is a continuation-in-part of applicationSer. No. 10/140,755 filed on May 7, 2002, the disclosure of bothapplications in their entirety is incorporated by reference herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention is directed to a packaging device and method for absorbingmoisture, steam, or condensation through the use of embeddedcarbon-containing substances.

2. Discussion of Related Art

A problem with packaging of goods arises when the packaging creates anenvironment which negatively affects the packaged content. One exampleis the packaging of fine art or other materials which decay or go badwhen moisture or a humid condition is trapped. Another example is thenegative effect on packaged food due to steam vapor in a container suchas a paper box or bag. The steam that emanates from a hot food such aspizza, french fries, etc. forms condensation that settles within the boxor bag, making the pizza or french fries soggy or spongelike. In thecase of packaging used for temporarily storing and transporting a hotpizza pie, the packaging is typically a box constructed of eithercorrugated boxboard, or containerboard. Corrugated boxboard is made bygluing an accordion-like sheet of paper (corrugated medium) in betweentwo sheets of linerboard. Containerboard, or what is also called ‘claykraft back’ is a paperboard that does not have any corrugated layer.Containerboard is commonly used for forming boxes such as a shoe box.

The condensation that settles on the inside bottom surface of the pizzabox is absorbed by the pizza dough by the time the pizza is transportedto a place where it can be consumed. Similarly, the Kraft Paper commonlyused as grocery bags for temporarily housing other hot food such asfrench fries, fried chicken, etc. also cannot absorb the vapor from thehot food. The trapped vapor renders the french fries soggy.

Accordingly, it is desirous to have a packaging device and methodcapable of absorbing moisture, steam, or condensation.

SUMMARY OF THE INVENTION

According to an embodiment of the present invention, a container forhousing food is provided, comprising paper having carbon additives forabsorbing moisture emanating from the food, wherein the carbon additivesinclude one of charcoal, activated charcoal and activated carbon,wherein the paper is one of a containerboard, a linerboard, and acorrugated medium.

According to an aspect of the present invention, the container,preferably a corrugated boxboard, includes a plurality of sheets orlinerboards, and the carbon additives are embedded in at least one ofthe plurality of sheets or linerboards, wherein the sheets of paper aremade from a mixture of pulp, water, and the carbon additives.

Preferably, one, two, or three of the plurality of sheets is/areselectively embedded with the carbon additives. In one embodiment, oneof the plurality of sheets is corrugated and another sheet isperforated.

A method is also provided for absorbing moisture from food within acontainer comprising; embedding carbon additives within paper, andforming the container using the paper. Preferably, the carbon additivesinclude charcoal, activated charcoal and activated carbon. The paper isone of a linerboard, a containerboard, and a corrugated medium. Thepaper includes a plurality of sheets, each sheet formed from a pluralityof layers, and the carbon additives are embedded in at least one of theplurality of sheets. The sheets of paper are made from a mixture ofpulp, water, and the carbon additives, wherein one, two or three of theplurality of sheets are embedded with the carbon additives.

According to another embodiment of the invention, the plurality ofsheets include an inner sheet and a corrugated sheet, the inner sheethaving perforations and the corrugated sheet having the embedded carbonadditives.

A process for manufacturing a container for storing food is alsoprovided, comprising; forming layers of paper with embedded carbonadditives by mixing pulp, water, and the carbon additives; and forming aboxboard with a plurality of sheets of linerboards of the paper to housethe food, wherein the step of forming a box includes using a pluralityof layers of paper forming sheets or linerboards, including at least aninner linerboard and an outer linerboard. The process further includingadding perforations to the inner linerboard and corrugating one of theplurality of sheets of paper.

BRIEF DESCRIPTION OF THE DRAWINGS

Other uses and features of the present invention will become apparentfrom the following detailed description considered in connection withthe accompanying drawings which disclose several embodiments of thepresent invention. It should be understood, however, that the drawingsare designed for the purpose of illustration only and not as anexhaustive list of its possible uses.

In the drawings wherein similar reference characters denote similarelements throughout the different embodiments:

FIG. 1 shows a paper box in an opened configuration according to thepresent invention;

FIG. 2 shows a sideview of the paper box; and

FIG. 3 shows a cross-sectional view of a corrugated medium in aboxboard.

DETAILED DESCRIPTION OF THE PREFFERED EMBODIMENTS

The invention is directed to packaging product for housing goods. Thepackaging product is preferably made of paperboard, linerboard, orcontainerboard having charcoal, activated charcoal, or activated carbonas an additive for absorbing moisture, vapor, or condensation(hereinafter referred to as “Coalboard”). Charcoal, activated charcoal,carbon, or substances mostly comprised of carbon are used as additivesbecause of their superior absorbent characteristics, partly due to theirextremely vast surface area. The charcoal, activated charcoal, activatedcarbon, or substances mostly comprised of carbon is mixed with the woodfiber (more commonly known as pulp) in the blend chest. The refined pulpand water with the charcoal, activated charcoal, activated carbon, orsubstances mostly comprised of carbon added would then be sent on to thepapermaking machine. In one embodiment, the linerboard with the embeddedcharcoal is disposed within a packaging container which is perforated onthe interior side to enable steam vapor or humidity to enter into thecorrugated medium. In another embodiment, a boxboard is made ofcontainerboard with embedded charcoal, activated charcoal or substancesmostly comprised of carbon. With this packaging and method according tothe present invention, the contents of the package can be protectedagainst humidity, moisture, and steam.

FIG. 1 shows a pizza box made of Coalboard according to the presentinvention. The steam vapor that is emitted from the pizza would be drawnthrough the perforations and be absorbed by the charcoal. It is readilyapparent that pizza is only one example of packaged food that wouldbenefit from the vapor absorbing qualities of CoalBoard. Although thisis one embodiment of the present invention, it is not the exclusiveembodiment.

Referring to FIGS. 1 to 3 and according to a first embodiment of thepresent invention, all three sheets of the boxboard 1, which comprisesexterior linerboard 3, interior linerboard 5, and corrugated medium 4are embedded with charcoal, activated charcoal, activated carbon, orsubstances mostly comprised of carbon. The interior linerboard 5 thatfaces the food product includes perforations 2 to enable the steam vaporgenerated from the hot food to enter into the corrugated medium 4.

According to a second embodiment of the invention, two sheets of theboxboard 1, preferably interior linerboard 5, and corrugated medium 4are embedded with charcoal, activated charcoal, activated carbon, orsubstances mostly comprised of carbon as an additive. The interiorlinerboard 5 facing the food product is preferably perforated 2 toenable the steam vapor generated from the hot food to enter into thecorrugation 4.

According to a third embodiment of the invention, the exteriorlinerboard 3, and corrugated medium 4 are embedded with charcoal,activated charcoal, activated carbon, or substances mostly comprised ofcarbon as an embedded additive. The interior linerboard 5 facing thefood product would be perforated 2 to enable the steam vapor generatedfrom the hot food to enter into the corrugation 4.

According to a fourth embodiment of the invention, one sheet of theboxboard 1, preferably the interior linerboard 5 is embedded withcharcoal, activated charcoal, carbon, or substances mostly comprised ofcarbon as an embedded additive. The interior linerboard 5 facing thefood product would be perforated 2 to enable the steam vapor generatedfrom the hot food to enter into the corrugation 4.

According to a fifth embodiment of the invention, the exteriorlinerboard 3 is the only sheet having charcoal, activated charcoal,carbon, or substances mostly comprised of carbon as an embeddedadditive. The interior linerboard 5 facing the food product would beperforated 2 to enable the steam vapor to enter into the corrugation 4.

According to a sixth embodiment of the invention, the corrugated medium4 is the sheet having charcoal, activated charcoal, carbon, orsubstances mostly comprised of carbon as an embedded additive. Theinterior linerboard 5 facing the food product would be perforated 2 toenable the steam vapor generated from the hot food to enter into thecorrugation 4.

According to a seventh embodiment of the invention, the boxboard is madefrom containerboard having charcoal, activated charcoal, carbon, orsubstances mostly comprised of carbon as an embedded additive. In thisembodiment, the boxboard does not include a corrugated medium.

As an alternative to mixing the additive in the pulp formulationprocess, there are a number of processes that can be used to introducecharcoal, activated charcoal, activated carbon, or substances mostlycomprised of carbon into paper. One exemplary process is by bladecoating, which is a method of coating paper and paperboard using aflexible blade to control the amount of coating applied to the paper.Blade-coating can take place either on a papermaking machine or on anoff-machine coater. The paper may be coated on one side (C1S) or bothsides (C2S), or between layers of paper as described in the aboveembodiments. Off-machine coating refers to coating paper after it comesoff the papermaking machine rather than while it is still on themachine. Preferably, an off-machine coater is used to add one or morelayer of coating of the carbon material to the paper. Other knownprocesses such as bath coating or surface siezing coating may also beused to mix or coat the carbon material onto the paper.

We did four side-by-side tests with identical pizza pies under theidentical conditions. We lined the perimeter of one of the boxes withpulverized charcoal, and left the other box as it would normally beused. After nine minutes cooking at 500 degrees (industry standard), weplaced both pies in their respective boxes and let them settle for 5, 7,10, and 15 minutes. The first three tests were conducted as statedabove, the third test we perforated an additional box top and stapled itto the actual top with charcoal sandwiched in between. In each case, thepizza that was in the box with the charcoal was noticeably more crispy.The longer the period of time that we let the pies settle, the morepronounced the effect.

Having thus described the invention with the details and particularityrequired by the patent laws, it is noted that modifications andvariation can be made by persons skilled in the art in light of theabove teachings. It is therefore to be understood that changes may bemade in the particular embodiments of the invention disclosed which arewithin the scope and spirit of the invention as defined by the appendedclaims.

1. A boxboard formed by a plurality of sheets of paper, comprising: atleast one of the sheets of paper having activated carbon andcorrugation, and another sheet of paper having perforations.
 2. Theboxboard of claim 1, wherein the plurality of sheets of paper includesan inner sheet, an intermediate sheet, and an outer sheet of paper, theouter sheet defining an exterior of the boxboard, wherein the at leastone sheet of paper with activated carbon and corrugation is theintermediate sheet, and the sheet with the perforations is the innersheet.
 3. The boxboard of claim 2, wherein the intermediate sheetfurther includes perforations.
 4. The boxboard of claim 1, wherein theplurality of sheets of paper includes an intermediate first and secondsheets, an outer sheet defining an exterior of the boxboard, wherein thesheet of paper with activated carbon is the first intermediate sheet andthe corrugated sheet of paper is the second intermediate sheet, and thesheet with the perforations is the inner sheet.
 5. The boxboard of claim1, wherein activated carbon is applied to at least one sheet of paper bycoating.
 6. The boxboard of claim 5, wherein the coating of activatedcarbon includes use of one of a paper making machine or an off-machinecoating.
 7. The boxboard of claim 5, wherein the coating of activatedcarbon includes bath coating.
 8. The boxboard of claim 5, wherein thecoating of activated carbon includes surface sizing coating.
 9. Theboxboard of claim 1, wherein the activated carbon is embedded in the atleast one sheet of paper by mixing pulp, water and activated carbon. 10.The boxboard of claim 2, wherein the inner and intermediate sheets ofpaper include the activated carbon.
 11. A boxboard formed by a pluralityof sheets of paper, comprising: at least one of the sheets of paperhaving charcoal and corrugation, and another sheet of paper havingperforations.
 12. The boxboard of claim 11, wherein the plurality ofsheets of paper includes an inner sheet, an intermediate sheet, and anouter sheet of paper, the outer sheet defining an exterior of theboxboard, wherein the at least one sheet of paper with charcoal andcorrugation is the intermediate sheet, and the sheet with theperforations is the inner sheet.
 13. The boxboard of claim 12, whereinthe intermediate sheet further includes perforations.
 14. The boxboardof claim 11, wherein the plurality of sheets of paper includes anintermediate first and second sheets, an outer sheet defining anexterior of the boxboard, wherein the sheet of paper with charcoal isthe first intermediate sheet and the corrugated sheet of paper is thesecond intermediate sheet, and the sheet with the perforations is theinner sheet.
 15. The boxboard of claim 11, wherein charcoal is appliedto at least one sheet of paper by coating.
 16. The boxboard of claim 15,wherein the coating of charcoal includes use of one of a paper makingmachine or an off-machine coating.
 17. The boxboard of claim 15, whereinthe coating of charcoal includes bath coating.
 18. The boxboard of claim15, wherein the coating of charcoal includes surface sizing coating. 19.The boxboard of claim 11, wherein the charcoal is embedded in the atleast one sheet of paper by mixing pulp, water and charcoal.
 20. Theboxboard of claim 12, wherein the inner and intermediate sheets of paperinclude the charcoal.